Apparatus and method for controlling pressure of braking system

Abstract

An apparatus for controlling pressure of a braking system including a pressure sensor configured to detect a pressure value within the braking system mounted in a vehicle, and collect the detected pressure value as an analog pressure signal; and a control device configured to calibrate the analog pressure signal received from the pressure sensor, convert the calibrated analog pressure signal into a digital pressure signal, and output the digital pressure signal.

What is claimed is: 
     
       1. An apparatus for controlling pressure of a braking system, comprising:
 a pressure sensor configured to detect a pressure value within the braking system mounted in a vehicle, and collect the detected pressure value as an analog pressure signal; and 
 a control device configured to calibrate the analog pressure signal received from the pressure sensor, convert the calibrated analog pressure signal into a digital pressure signal, and output the digital pressure signal, 
 wherein the control device increases the number of measurement points as the pressure value decreases. 
 
     
     
       2. The apparatus of  claim 1 , wherein the control device converts the analog pressure signal into a log scale pressure signal, converts the log scale pressure signal into a digital pressure signal, and outputs the digital pressure signal. 
     
     
       3. The apparatus of  claim 1 , wherein the control device divides the analog pressure signal into zones having variable tolerance, in order to calibrate the analog pressure signal. 
     
     
       4. The apparatus of  claim 3 , wherein:
 the control device divides the analog pressure signal into a low pressure zone and a high pressure zone based on a preset reference value, and converts an analog pressure signal corresponding to the low pressure zone into a log scale pressure signal; and 
 the control device sorts the low pressure zone into a zone larger than the high pressure zone, and performs precision control on the low pressure zone. 
 
     
     
       5. The apparatus of  claim 1 , wherein the control device compares the analog pressure signal to a preset zone reference value, converts the analog pressure signal into a scaling and digital pressure signal according to the comparison result, and outputs the scaling and digital pressure signal. 
     
     
       6. The apparatus of  claim 5 , wherein the control device comprises:
 a selector configured to compare the analog pressure signal to a preset low limit reference value or a preset upper limit reference value; 
 a first converter configured to convert the analog pressure signal into a digital pressure signal when the comparison result of the selector indicates that the analog pressure signal is equal to or less than the lower limit reference value or equal to or more than the upper limit reference value; and 
 a second converter configured to convert the analog pressure signal into a digital pressure signal by amplifying the analog pressure signal by a preset multiple, attenuate the digital pressure signal by the preset multiple, and output the attenuated digital pressure signal when the comparison result of the selector indicates that the analog pressure signal exceeds the lower limit reference value and is less than the upper limit reference value. 
 
     
     
       7. The apparatus of  claim 1 , wherein, in order to calibrate the analog pressure signal, the control device differently sets zones of the analog pressure signal according to vehicle state information. 
     
     
       8. The apparatus of  claim 7 , wherein the control device increases the number of measurement points in a zone requiring high precision, among the set zones, to be greater than in the other zones. 
     
     
       9. A method for controlling pressure of a braking system, comprising:
 detecting, by a pressure sensor, a pressure value within the braking system mounted in a vehicle, and outputting an analog pressure signal based on the detected pressure value; 
 converting, by a control device, the analog pressure signal into a log scale pressure signal; and 
 converting, by the control device, the log scale pressure signal into a digital pressure signal, and outputting the digital pressure signal, 
 wherein the control device increases the number of measurement points as the pressure value decreases. 
 
     
     
       10. The method of  claim 9 , wherein, in the converting of the analog pressure signal into the log scale pressure signal, the control device divides the analog pressure signal into zones having variable tolerance, and converts the analog pressure signal into a log scale pressure signal. 
     
     
       11. The method of  claim 10 , wherein:
 the converting of the analog pressure signal into the log scale pressure signal comprises:
 dividing, by the control device, the analog pressure signal into a low pressure zone and a high pressure zone, based on a preset reference value; and 
 converting the analog pressure signal corresponding to the low pressure zone into a log scale pressure signal; and 
 
 the control device sorts the low pressure zone into a zone larger than the high pressure zone, and performs precision control on the low pressure zone. 
 
     
     
       12. A method for controlling pressure of a braking system, comprising:
 sensing, by a pressure sensor, a pressure value within the braking system mounted in a vehicle, and outputting an analog pressure signal based on the sensed pressure value; and 
 comparing, by a control device, the analog pressure signal to a preset zone reference value, converting the analog pressure signal into a scaling and digital pressure signal according to the comparison result, and outputting the scaling and digital pressure signal. 
 
     
     
       13. The method of  claim 12 , wherein the comparing of the analog pressure signal to the scaling and digital pressure signal comprises:
 comparing, by the control device, the analog pressure signal to a preset low limit reference value or a preset upper limit reference value; and 
 converting, by the control device, the analog pressure signal into a digital pressure signal and outputting the digital pressure signal, when the comparison result indicates that the analog pressure signal is equal to or less than the low limit reference value or equal to or greater than the upper limit reference value. 
 
     
     
       14. The method of  claim 13 , further comprising converting, by the control device, the analog pressure signal into a digital pressure signal by amplifying the analog pressure signal by a preset multiple, attenuating the digital pressure signal by the preset multiple, and outputting the attenuated digital pressure signal, when the comparison result indicates that the analog pressure signal is greater than the lower limit reference value and is less than the upper limit reference value.